ACDelco Professional, premium aftermarket Return Fuel Line/PVC/Evaporative Emission Control Hoses (1986 & Older) are multi-purpose hoses used on Return Fuel Lines, PCV, and EEC systems, and for fuel return hose connections on diesel fuel injection systems. They are approved for use with leaded and unleaded gasoline, diesel, and gasoline blends of ethanol (E85), methanol, and ethers (up to the legal limits allowed by the EPA). They are temperature rated from -40 degrees Fahrenheit to 257 degrees Fahrenheit (-40 degrees Celsius to 125 degrees Celsius) with gasoline blends. These premium aftermarket replacement hoses are manufactured to meet your expectations for fit, form, and function.